Chen Hsiao-Chien, Yang Chih-Ping, Hong Chien-Tai, Hsu Chun-Tsung, Hu Chi-Chang, Liu Yu-Chuan
Department of Biochemistry and Molecular Cell Biology, School of Medicine, College of Medicine, Taipei Medical University, No. 250, Wuxing Street, Taipei 11031, Taiwan.
Department of Neurology, School of Medicine, College of Medicine, Taipei Medical University, No. 250, Wuxing Street, Taipei 11031, Taiwan.
ACS Omega. 2019 May 2;4(5):8007-8014. doi: 10.1021/acsomega.9b00463. eCollection 2019 May 31.
Liquid water is the most commonly used environmental-friendly solvent and reactant in chemical reactions and physical processes. Conventionally, it is considered as a passive reactant. In this work, we investigate the potential of plasmon-activated water (PAW) with intrinsically reduced hydrogen-bonded structures compared to normal deionized (DI) water to serve as an active green energy resource. The efficiency of the electrochemical oxidation of water performed on a platinum electrode to form hydrogen peroxide is significantly enhanced in PAW compared to that in DI water. In addition, the limiting current density of the oxygen reduction reaction on a platinum/carbon-coated disk electrode is also enhanced when using PAW (in 0.9 wt % NaCl or in 0.1 M KOH). Moreover, the cell capacitance with semitransparent platinum-coated fluorine-doped SnO electrodes is significantly increased from ca. 2 × 10 to 6.1 × 10 F when decreasing the applied frequency from 10 to 0.1 Hz in a cell containing PAW instead of DI water (without the supporting electrolyte). More interestingly, compared to that in DI water, the efficiencies of the hydrogen evolution reaction in an acid solution (0.05 M HSO) and the oxygen evolution reaction in an alkaline solution (0.1 M KOH) performed with PAW in situ increase by about 20% with nanoscale-granulated gold electrodes under resonant illumination. These increases are more significant in neutral solutions for hydrogen evolution reactions and oxygen evolution reactions.
液态水是化学反应和物理过程中最常用的环保型溶剂和反应物。传统上，它被视为一种被动反应物。在这项工作中，我们研究了与普通去离子水相比具有内在减少氢键结构的等离子体活化水（PAW）作为一种活性绿色能源的潜力。与在去离子水中相比，在PAW中在铂电极上进行的水的电化学氧化以形成过氧化氢的效率显著提高。此外，当使用PAW（在0.9 wt%NaCl或0.1 M KOH中）时，铂/碳涂覆盘电极上氧还原反应的极限电流密度也会提高。而且，在含有PAW而非去离子水（无支持电解质）的电池中，当将施加频率从10 Hz降低到0.1 Hz时，具有半透明铂涂覆氟掺杂SnO电极的电池电容从约2×10显著增加到6.1×10 F。更有趣的是，与在去离子水中相比，在共振光照下用纳米级颗粒状金电极时，PAW在酸性溶液（0.05 M HSO）中进行的析氢反应和在碱性溶液（0.1 M KOH）中进行的析氧反应的效率原位提高了约20%。这些提高在中性溶液中对于析氢反应和析氧反应更为显著。
